Kling 4.0: What Was Announced, and What Changes From 3.0

What was announced, and when

The still above is from Neon Debt, an episode this site took from script to composite.

On September 28, 2026 Kling announced two models: Kling 4.0 and Kling 4.0 Flash. The announcement is published on Kling's own model-release page; the specification tables below restate it, and each figure can be traced to the sources at the end of this page.

The two models did not arrive together in the same form. Kling 4.0 Flash opened the same day as an early-access preview for a limited batch of creators (accounts differ on exactly who qualifies, so we do not name a condition here). The full Kling 4.0 was described in the announcement as arriving in October; no day was given.

That is the state we found when we checked on October 15, 2026: no release announcement for the full model, no open API, no published model IDs, and no published pricing for either version. If all of that changes, the first place it should show up is Kling's own release page — not a roundup like this one.

The announced specifications

This is everything the announcement stated about the full Kling 4.0, in one place. Where a feature was announced as coming later, it says so.

Those are the officially announced numbers. Nothing in the table is a measurement: nobody outside Kling has run a released model yet, so treat them as the specification the launch is measured against.

What a keyframe is, and why ten of them matter

The frame controls are the most consequential change for anyone writing shot by shot. A first frame pins where a shot starts and a last frame pins where it ends; the model moves the action between those two points. Kling 3.0 already had first-and-last-frame mode.

Keyframes go further: they are additional pinned frames placed at chosen moments inside the clip. Up to 10 of them were announced. In practice this lets you write a shot the way a storyboard reads — a character raises the letter at second 4, drops it at second 9, turns to the door at second 14 — instead of describing the whole movement in prose and hoping the take lands on each beat.

For a series, the difference is mostly about landing beats: the moments a cut depends on. A take that has to end on a specific pose, a prop that has to change hands on cue, a reveal that has to happen at a written second. Keyframes are how the announced 4.0 gives those moments a fixed time.

What changes from Kling 3.0

Kling 3.0 and 3.0 Omni were announced in February 2026 and are documented on Kling's own blog. The table compares what each generation announced; the 3.0 column is what that release actually stated, not what it later added.

The pattern is that 4.0 turns dials 3.0 had already introduced. Longer takes, more pinned moments, more references, more languages, plus an editing layer that 3.0 did not announce at all.

4.0 and 4.0 Flash are not the same release

The second model announced on September 28 is Kling 4.0 Flash, positioned for high-volume creation: clips of 3–20 seconds, 720p output, 8-bit SDR, and the text-to-video, first-frame and Omni Reference modes. It does not get first-and-last-frame or multi-keyframe control in the announcement, and its audio and editing capabilities were not stated.

Flash went to a limited group of creators first. Which one suits a given production is a real question with a short answer and a long one — Kling 4.0 vs Kling 4.0 Flash works through it.

What is announced but not here yet

Three items in the announcement are explicitly later work, and it is worth keeping them separate from what exists:

• Extension to 2 minutes. Announced as coming soon. Until it ships, the long-take ceiling in the announcement is 30 seconds.
• 10-bit HDR at 1080p and 4K. Also announced as coming soon. The resolution list itself (720p, 1080p, 4K) is not marked that way.
• The full model's release itself. Announced for October 2026 with no date; as of October 15 there was no report of it going live.

Two more things are simply unknown rather than promised: pricing — nothing was published for either version — and the API, which was not open at the time of writing. Anyone quoting a per-second price for Kling 4.0 today is quoting a guess.

How to read this page, and announcements like it

Everything above is the officially announced specification. We did not run the model, because there is no released model to run, and we did not repeat measurements from other sites as if they were tests.

That is also the way to read the next announcement you find: check whether the numbers come from the maker's own release notes or from a roundup of them, and check the date on whatever you are reading. Specifications change between announcement and release, and "coming soon" items have a habit of slipping past the launch.

Side by side with this site's own pipeline, the same announcement is covered on our Kling 4.0 page, with the lighter model on Kling 4.0 Flash.

What a 30-second, keyframed generation means for series work

Strip away the version numbers and the announcement is about length and control per take: a single generation can now cover a beat that used to need two or three, and the moments inside it can be pinned.

Series work has wanted exactly that for a while. A short-drama episode is a stack of segments, and every segment joins the next one at a cut, so the value of a longer take is not the length itself — it is fewer joins to police, and more of the performance kept in one piece.

The other half of the working method does not change with any version number: the story is still decided in the script and the shot list. SceneMixer turns a script into an episode outline, then a storyboard where every shot carries its seconds, the cast in frame and the lines to be spoken, then renders those shots segment by segment and joins them into one file per episode. How to make an AI short drama walks through that pipeline end to end, and character consistency covers the reference-image layer that keeps a cast recognisable across episodes — the same problem Omni Reference is built for.

Video tiers on this site are chosen per segment and priced per second, with the price printed on the generate button before anything is charged; the current list and rates are on the pricing page. When a model like Kling 4.0 reaches general release, it is the kind of thing that gets added as a tier; until then this page stays a specification page, not a how-to.

Sources

• Kling: 4.0 model release page (kling.ai) — the announcement itself; the specification tables above restate it, checked October 15, 2026.
• Runware: Kling 4 specification table — a restatement of the announced specs (clip length, resolution, keyframes, Omni Reference limits, audio, editing).
• OrcaRouter: Kling 4.0 release-date roundup (October 4, 2026) — release status: full version still to come, Flash in limited preview.
• Kling: Video 3.0 Omni multi-shot and native-audio guide (kling.ai blog) — the Kling 3.0 column in the comparison.

Kling is a trademark of its owner and is named here only to identify the product; SceneMixer is not affiliated with it. Specifications are quoted as announced and may change before release.

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Updated October 15, 2026